A circular saw having a machine frame having a table board and a swivel frame arranged underneath the table board, which is swiveled about a swivel axis coplanar with the top side of the table board. The swivel frame accommodates a height adjustable tool bracket carrying at least one cutting tool engaging an associated slot in the table board. The swivel frame in the region of its ends is swivel-suspended on bearing brackets which are mountable on the bottom side of the table board, and are swiveled by an articulated adjusting rod. The tool bracket is height adjusted by an adjusting element which is arranged in driving linkage with an extendable articulated shaft. The adjusting rod and the articulated shaft are operated by cranks mounted on the operating side of the machine frame.
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1. A woodworking machine, in particular a circular saw, having a machine frame on which a table board is accommodated, and further having a swivel frame arranged underneath the table board, which is swivelled about a swivel axis coplanar with the top side of the table board, which swivel frame accommodates a height adjustable tool bracket carrying at least one cutting tool engaging an associated slot in the table board, which tool can be clamped onto a shaft drivable by a motor attached to the tool bracket, wherein the swivel frame in the region of its ends, which in cutting direction lie opposite each other, is swivel-suspended on bearing brackets which are mounted on the bottom side of the table board, and is swivelled by means of an articulated adjusting rod arranged with a degree of freedom for tilting movements, and further in that the tool bracket accommodated on the swivel frame is height adjusted by means of an adjusting element provided on the swivel frame, such adjusting element being arranged in driving linkage with an extendable articulated shaft, and further in that the adjusting rod is connected to a first actuating means, the articulated shaft is connected to a second actuating means and each actuating means being firmly mounted not to allow translation thereof on the operator side wall of the machine frame.
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The present invention relates to a woodworking machine, in particular a circular saw, provided with a machine frame on which a table board is accommodated, and further provided with a swivel frame arranged underneath the table board, which can be swivelled about a swivel axis coplanar with the top side of the table board, which swivel frame accommodates a height adjustable tool bracket carrying at least one cutting tool engaging an associated slot in the table board, which tool can be clamped onto a shaft drivable by a motor attached to the tool bracket.
An arrangement of this kind is known, for example, from EP 0 235 683 B1. In this known arrangement, the swivel frame, in the region of its front and rear end, is provided with sliding stones which in pairs engage an associated curved slot of a front and rear stationary end shield which is integrated into the machine frame. Such end shields, at their bottom rim which is concentric to the curved slot, are provided with gear teeth which are in engagement with a pinion that can be driven by a handwheel. The pinion shaft associated with the pinions and accommodating the handwheel is mounted on the swivel frame and projects from the machine frame requiring, for that purpose, a reach-through slot which is arranged in concentric position to the curved slot of the stationary end shields.
The disadvantage, however, of such an arrangement lies in the fact that the pinion shaft carries out all swivel movements of the swivel frame, so that the handwheel accommodated on the pinion shaft changes its position during each swivel movement of the swivel frame. This constitutes an undesirable effect with regard to operation. Furthermore, the reach-through slot of the machine frame, through which the pinion shaft extends may constitute a safety risk and has to be guarded accordingly. The direct transmission of the rotary movement of the handwheel to the swivel frame has an unfavourable effect also with regard to the obtainable degree of accuracy. Furthermore, in the known arrangement the swivel frame suspended in the machine frame is separated from the table board, rendering assembly difficult.
On the basis of the foregoing, it is thus the object of the present invention to improve a device as described initially above by using simple and low-cost means, so that not only a high degree of user-friendliness, safety and accuracy, but also a clear-cut design are achieved.
According to the invention, this object is achieved in that the swivel frame in the region of its ends, which in cutting direction lie opposite each other, is swivel-suspended on bearing brackets which are mountable on the bottom side of the table board, and can be swivelled by means of an articulated adjusting rod arranged with a degree of freedom for swivel movements, and further in that the tool bracket accommodated on the swivel frame can be height adjusted by means of an adjusting element provided on the swivel frame, such adjusting element being arranged in driving linkage with an extendable articulated shaft, and further in that the adjusting rod and the articulated shaft can be operated by at least one actuating means firmly mounted on the operating side of the machine frame.
In this example, the table board as well as the swivel frame together with the tool bracket constitute a group of components all of which, in an advantageous manner, can be pre-assembled. This fact ensures an exact position of the swivel axis of the swivel frame, which is coplanar with the table surface, and thus a high degree of obtainable working accuracy. The adjusting rod associated with the swivel frame and actuatable by means of an actuating means further ensures a high reduction ratio which has an advantageous effect on the achievable degree of operating accuracy. The same applies to the articulated shaft associated with the tool bracket, ahead of and/or following which provision may be made for reduction devices. A further advantage of the measures according to the invention lies in the fact that each actuating means, due to its flexibility within the drive train, is in a stationary position relative to the swivel frame and/or the tool bracket, so that neither in this case a reach-through slot in the housing associated with a shaft connected with an actuating means is required. As a result, a high degree of user-friendliness and safety as well as high stability of the machine housing is obtained. The measures according to the invention thus in an advantageous manner completely avoid the disadvantages of the prior art arrangement.
Advantageous embodiments and expedient developments of the main-claim measures will be evident from the sub-claims.
Thus, the adjusting rod associated with the swivel frame may advantageously be designed as a threaded spindle which on one side engages a bolt which is swivel-mounted in the swivel frame and in axial direction accommodated stationary in the same, and is on the other side swivel-mounted about the axle of the associated actuating means and acts together with the associated actuating means via angle drive. By using a threaded spindle, a comparatively high reduction ratio is achieved which, if required, may even be increased by a suitable design of the angle drive. Furthermore, the threaded spindle in an advantageous manner causes a self-locking effect which enhances operating convenience and accuracy.
In a further development, the adjustin element associated with the tool bracket may advantageously be designed as a threaded spindle which is provided on the swivel frame in a vertical position, which threaded spindle engages a bolt firmly attached to the tool bracket and, via an angle drive, is connected with an articulated shaft provided with joints at both ends thereof. This arrangement likewise ensures in an advantageous manner a high reduction ratio as well as a self-locking effect.
A further, particularly preferable measure may consist in that the adjusting rod and the adjusting spindle are associated with an actuating means each which may be provided in an advantageous manner at a certain lateral distance and at the same level. Said measures enable the swivel device and the height adjustment to be actuated synchronously.
Expediently, the swivel frame may be designed as a casting comprising a vertical wall which is provided with at least one window opening toward the top through which passes a shaft carrying a cutting tool and, on the side away from the tool comprises a projection accommodating the vertical threaded spindle associated with the tool bracket, as well as guiding means for the tool bracket in a direction parallel to the spindle. This arrangement permits a low-cost and torsion-resistant design of the swivel frame. It is therefore sufficient to provide one adjusting rod.
Advantageously, the swivel frame, at least on its tool side, may be provided with a circumferential marginal flange to which a cover plate is attached and which is preferably interrupted in the tool area. Thus, a chamber associated with the tool and opening towards the top is advantageously formed which can be connected to an exhaust device, which facilitates chip removal.
Expediently, the tool bracket may likewise be designed as a casting comprising a vertical wall which, on the one hand, is provided with projections having guide sleeves, as well as a bearing region associated with the tool carrying shaft, and, on the other hand, with a projection comprising the nut acting together with the threaded spindle thus forming the adjusting element. This arrangement results in a tool bracket which combines the advantages of low-cost and torsion-resistant construction. Simultaneously, the use of castings for the swivel frame and the tool bracket permit a high degree of freedom from vibration, which likewise has a positive effect on the obtainable degree of accuracy.
Further advantageous embodiments and expedient developments of the invention will be evident from description of an example given below in conjunction with the accompanying drawings(s), wherein.
The present invention is mainly used for circular saws which are provided with a cutting tool having the form of a circular saw blade. The circular saw underlying the drawing possesses a housing-shaped machine frame 1 on which a table board 2 is accommodated. The housing-shaped machine frame 1, as is evident from
The saw blade 5 can be adjusted in height, which fact permits the machining of workpieces of a different thickness. In order to make angular cuts which are inclined relative to the surface of the table board 2, it is possible to tilt the saw blade 5. The swivel axis is practically formed by the intersection line of the surface of the table board 2 with the centre plane of the saw blade 5. Based on a vertical midway position shown by solid lines in
The saw blade 5, as can be seen in the
Said swivel frame 12, as can best be seen in
In order to swivel the swivel frame 12, an adjusting rod 17 is associated therewith, as can be seen in the
The height adjustable tool bracket 11 accommodated on the swivel frame 12, as is evident from the
The threaded spindle 26 is accommodated on a projection 28 of the swivel frame 12 extending underneath the tool bracket 11 and drivable by an angle drive 29 which is provided on the bottom side of the projection 28. The nut 27 is arranged on a projection 30 of the tool bracket 11 and extends over the projection 28.
The angle drive 29 is formed by two bevel gears, one of which is mounted on a receiving butt of the threaded spindle 26 and extends through the projection 28, while the other is accommodated on an associated gear shaft 31 mounted on a gear housing which is formed by a bow attached to the projection 28. Joined to the gear shaft 31 is an articulated shaft 32 which, with its other end, is joined to a drive wheel 33, as can best be seen from
By turning the handwheel 37, the threaded spindle 26 is driven via the drive train in the form of the chain drive comprising the circulating element 34, the articulated shaft 32 fitted with joints on both sides, and the angle drive 29. The rotational movement of the threaded spindle 26 is converted into an adjustment movement of the tool bracket 11 by means of the nut 27. As a result, this arrangement provides for a high reduction ratio as well as a self-locking effect.
The length of the articulated shaft 32, which is fitted with joints at both ends, is adjustable, so that such articulated shaft 32 permits a swivel movement of the swivel frame 12. For this purpose, the articulated shaft 32 is designed as a two-part shaft comprising two shaft sections 32a, b having multi edge areas which engage each other in a telescope-like manner. Said multi edge areas may be formed integral with each of the associated shaft sections.
In the illustrated example, provision is made for two handwheels 16 and 37, with the handwheel 16 serving for carrying out a swivel movement of the swivel frame 12 and the handwheel 37 serving for carrying out a height adjustment of the tool bracket 11 received on the swivel frame 12. The handwheels 16 and 37 are arranged at a certain lateral distance from each other and at approximately the same height level in the region of the operator side of the machine frame 1, as is evident from
As previously mentioned, the swivel frame 12 is expediently designed as a casting. The latter, as can be seen in the
On the side facing the cutting tool 5, the wall 38 of the swivel frame 12 does not possess any ribs. In this area, provision is solely made for a rim flange 42 extending at least laterally of and underneath the wall, but omitted on top of it or interrupted at least in the region of the cutting tool, to which rim flange 42 a cover plate 43 extending parallel to the wall is attached, as shown in
The tool bracket 11 is likewise formed as a casting comprising, as is shown in the
When cutting coated boards etc, a scoring tool is usually required which rotates in a direction opposite to the direction of rotation of the actual sawing tool 5. In
In the example illustrated, the vertical wall 38 of the swivel frame 12, as can be seen in
Attached to the add-on shield 58, as can best be seen in
To facilitate an exact setting of the desired height of the tool 5 and/or the desired swivel angle of the tool 5 provision is made for associated display devices from which the selected height and/or swivel angle can be read off. Each of the display devices comprises a scale and an associated pointer which are arranged in such a way that readings can be taken on the operator side of the machine, as can be seen in
The angle display unit comprises an angle scale 66 provided on a board 65 shown in
The height display device comprises at least one height scale 70 which is provided in the rim area of a window 69 of the inspection cover 4 and with which a movable pointer 71 is associated appearing in the area of the window 69. Such pointer, as is shown in
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
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Mar 02 2007 | Scheppach Fabrikation von Holzbearbeitungsmaschinen GmbH | (assignment on the face of the patent) | / |
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